Encyclopedia Astronautica

American sounding rocket. Two stage vehicle consisting of 1 x M55E1 + 1 x SR19AJ1

Success Rate: 100.00%. Launch data is: complete.

Status: Retired 1974.
Gross mass: 30,000 kg (66,000 lb).
Height: 16.00 m (52.00 ft).
Diameter: 1.68 m (5.51 ft).
Thrust: 935.00 kN (210,196 lbf).
Apogee: 50 km (31 mi).
First Launch: 1970.03.14.
Last Launch: 1974.10.24.
Number: 3 .

More... - Chronology...

Associated Countries
See also
Associated Manufacturers and Agencies
  • Boeing American manufacturer of rockets, spacecraft, and rocket engines. Boeing Aerospace, Seattle, USA. More...

  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.

Associated Launch Sites
  • Cape Canaveral America's largest launch center, used for all manned launches. Today only six of the 40 launch complexes built here remain in use. Located at or near Cape Canaveral are the Kennedy Space Center on Merritt Island, used by NASA for Saturn V and Space Shuttle launches; Patrick AFB on Cape Canaveral itself, operated the US Department of Defense and handling most other launches; the commercial Spaceport Florida; the air-launched launch vehicle and missile Drop Zone off Mayport, Florida, located at 29.00 N 79.00 W, and an offshore submarine-launched ballistic missile launch area. All of these take advantage of the extensive down-range tracking facilities that once extended from the Cape, through the Caribbean, South Atlantic, and to South Africa and the Indian Ocean. More...
  • Cape Canaveral LC31A Pershing, Minuteman, M55E1 launch complex. Built 1959-1960 to support the Air Force's Minuteman missile program. Used for Minuteman tests 1961-1970. In 1973 used briefly for the Army's Pershing 1A follow-on testing program. More...

Associated Stages
  • Minuteman 2-2 Solid propellant rocket stage. Loaded/empty mass 7,032/795 kg. Thrust 267.70 kN. Vacuum specific impulse 287.5 seconds. Second stage of Minuteman 2. Used as second stage of Minotaur launch vehicle and various SDI targets in 1980's. More...
  • Minuteman-1 Solid propellant rocket stage. Loaded/empty mass 23,077/2,292 kg. Thrust 791.30 kN. Vacuum specific impulse 262 seconds. First stage of Minuteman I. Proposed as zero stage for various Saturn variants in 1960's. Surplus motors used in ABM SDI tests in 1980's and 1990's. More...

M55E1 Chronology

1970 March 14 - . 18:00 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC31A. Launch Pad: LC31A/Truck. Launch Vehicle: M55E1.
  • Sheltered Base research and development mission - . Nation: USA. Agency: USAF AFSC. Apogee: 1.00 km (0.60 mi).

1974 September 8 - . Launch Site: WTR Launch Area. Launch Platform: C-5A. Launch Vehicle: M55E1.
  • Test mission - . Nation: USA. Agency: USAF AFSC. Apogee: 50 km (31 mi).

1974 October 24 - . Launch Site: WTR Launch Area. Launch Platform: C-5A. Launch Vehicle: M55E1.
  • Test mission - . Nation: USA. Agency: USAF AFSC. Apogee: 6.00 km (3.70 mi).

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